Electronic fuel injection system and method for engines

Abstract

A system includes an electronic fuel injection system of an engine, the electronic fuel injection system including an electronic governor control unit for controlling various functions of the engine.

We claim: 
     
       1. A method for automatically learning throttle position, comprising:
 monitoring a throttle position sensor voltage signal sent by a throttle position sensor to an electronic governor control unit, the throttle position sensor voltage signal representing a position of a throttle; 
 measuring a run time of an engine via a timer; 
 filtering the throttle position sensor voltage signal based on a value of the timer; and 
 saving a lowest measured value of the throttle position sensor voltage signal and assigning the lowest measured value to a zero percent throttle. 
 
     
     
       2. The method of  claim 1 , further comprising monitoring the throttle position sensor voltage signal continuously. 
     
     
       3. The method of  claim 1 , further comprising monitoring the throttle position sensor voltage signal periodically. 
     
     
       4. The method of  claim 1 , further comprising monitoring the throttle position sensor voltage signal every calculation loop. 
     
     
       5. The method of  claim 1 , wherein the step of measuring further comprises monitoring an age of the engine with the timer; and the step of filtering further comprises increasing a filter attenuation based on the age of the engine. 
     
     
       6. The method of  claim 1 , wherein the step of measuring further comprises monitoring an age of the engine and wherein the step of filtering comprises monitoring the throttle position sensor voltage signal over a longer period with increasing age. 
     
     
       7. The method of  claim 1 , further comprising resetting the timer when the throttle position sensor is replaced or when a throttle position is adjusted during maintenance. 
     
     
       8. The method of  claim 1 , wherein when a system reset is done on the engine, the lowest measured value is reset to a reference value stored in a calibration layer of the electronic governor control unit. 
     
     
       9. The method of  claim 1 , wherein the step of filtering comprises removing unwanted voltage spikes with a digital or analog filter. 
     
     
       10. A method for automatically learning throttle position, comprising:
 monitoring a throttle position sensor voltage signal, the throttle position sensor voltage signal representing a position of a throttle; 
 measuring a run time of an engine via a timer; 
 filtering the throttle position sensor voltage signal based on a value of the timer; and 
 saving a lowest measured value of the throttle position sensor voltage signal and assigning the lowest measured value to a zero percent throttle. 
 
     
     
       11. The method of  claim 10 , further comprising monitoring the throttle position sensor voltage signal continuously. 
     
     
       12. The method of  claim 10 , further comprising monitoring the throttle position sensor voltage signal periodically. 
     
     
       13. The method of  claim 10 , further comprising monitoring the throttle position sensor voltage signal every calculation loop. 
     
     
       14. The method of  claim 10 , wherein the step of measuring further comprises monitoring an age of an engine with the timer; and
 The step of filtering further comprises increasing a filter attenuation based on the age of the engine. 
 
     
     
       15. The method of  claim 10 , wherein the step of measuring further comprises monitoring an age of the engine and wherein the step of filtering comprises monitoring the throttle position sensor voltage signal over a longer period with increasing age. 
     
     
       16. The method of  claim 10 , further comprising resetting the timer when a throttle position sensor is replaced or when a throttle position is adjusted during maintenance. 
     
     
       17. The method of  claim 10 , wherein when a system reset is done on the engine, the lowest measured value is reset to a reference value stored in a calibration layer of an electronic governor control unit. 
     
     
       18. The method of  claim 10 , wherein the step of filtering comprises removing unwanted voltage spikes with a digital or analog filter. 
     
     
       19. A method for automatically learning throttle position, comprising:
 monitoring an age of an engine with a timer; 
 monitoring a throttle position sensor voltage signal sent by a throttle position sensor to an electronic governor control unit, the throttle position sensor voltage signal representing a position of a throttle; 
 removing unwanted voltage spikes with a digital or analog filter, the digital or analog filter having an attenuation which increases with increasing age of the engine; and 
 saving a lowest measured value of the throttle position sensor voltage signal and assigning the lowest measured value to a zero percent throttle. 
 
     
     
       20. The method of  claim 19 , wherein the step of removing further comprises monitoring the throttle position sensor voltage signal over a longer period with increasing age.